Radeon HD 4550 512MB vs Radeon HD 6450 (OEM)

Intro

Compare that to the Radeon HD 6450 (OEM), which uses a 40 nm design. AMD has clocked the core speed at 625 MHz. The GDDR3 RAM runs at a speed of 800 MHz on this card. It features 160 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB		25 Watts
Radeon HD 6450 (OEM)		31 Watts
	Difference: 6 Watts (24%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon HD 6450 (OEM) is a small bit (about 4%) faster with regards to AF than the Radeon HD 4550 512MB. (explain)

Radeon HD 6450 (OEM)		5000 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 200 (4%)

Pixel Rate

The Radeon HD 6450 (OEM) will be a bit (more or less 4%) more effective at AA than the Radeon HD 4550 512MB, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6450 (OEM)		2500 Mpixels/sec
Radeon HD 4550 512MB		2400 Mpixels/sec
	Difference: 100 (4%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.